{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1EA10-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1EA10-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1EA10-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1EA10-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1421-1EA10-ZX95, circuit breaker for transformer protection, 4 A continuous, CLASS 10 trip, 3-pole, screw terminals, 45 mm wide, DIN rail mount.","salesMarkdown":"## Transformer-protection motor starter protector The Siemens 3RV1421-1EA10-ZX95 is a SIRIUS-brand circuit breaker specifically designed for transformer protection — not a general-purpose motor circuit breaker. Rated 4 A continuous at up to 690 V, it carries a 100 kA breaking capacity at 400 V AC — that's a serious fault-current rating for a 45 mm wide package, enough to handle most distribution-panel SCCR requirements without cascading upstream breakers. The CLASS 10 curve is the headline here: it's steeper than a CLASS 20 motor-protector curve, so it trips faster on sustained overload. That makes it a match for transformer primaries where the inrush decays in a few cycles — but if you're tempted to swap it into a motor circuit with a long acceleration time, the nuisance-tripping risk goes up. Rated 100 kA at 240 V, 400 V, and 500 V AC, then drops to 6 kA at 690 V AC. That 690 V figure is the weak point: if your fault current at 690 V exceeds 6 kA, this breaker isn't your choice — you need a higher-rated unit or a current-limiting fuse upstream. The terminals accept 2× solid or stranded conductors from 1 to 2.5 mm² and 2× from 2.5 to 6 mm² — plenty of capacity for the 4 A rating. At 45 mm wide × 97 mm high × 96 mm deep, it's a compact 3-pole unit. Zero clearance needed at the sides or back for cooling, so you can pack it tight on the rail. IP20 on the front with finger-safe touch protection — safe for open-panel installation where operators might brush against the front face. The auxiliary switch option is available, so you can wire a remote status signal back to the PLC.","metaTitle":"Siemens 3RV1421-1EA10-ZX95 SIRIUS Circuit Breaker, 4 A, CLAS","metaDescription":"Siemens 3RV1421-1EA10-ZX95 SIRIUS circuit breaker for transformer protection, 4 A continuous, CLASS 10 trip, 100 kA at 400 V, screw terminals, DIN rail mount. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Solid":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Width":"45 mm","Height":"97 mm","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Backwards":"0 mm","Trip Class":"CLASS 10","At The Side":"0 mm","Rated Value":"690 V","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Shock Resistance":"25g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Product Designation":"circuit breaker","Design Of The Product":"for transformer protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"100 kA","at AC at 500 V rated value":"100 kA","at AC at 690 V rated value":"6 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"7.25 W","Substance Prohibitance (Date)":"01.05.2012","Continuous Current Rated Value":"4 A","at AWG cables for main contacts":"2x (14 ... 10)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 000 V","at AC in hot operating state per pole":"2.4 W","Finely Stranded With Core End Processing":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","number of CO contacts for auxiliary contacts":"0","operational current at AC-3 at 400 V rated value":"4 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Design Of The Overcurrent Release And Short-Circuit Release":"thermomagnetic","Arrangement Of Electrical Connectors For Main Current Circuit":"front side","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","Mechanical Service Life (Switching Cycles) Of The Main Contacts Typical":"100 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"2.8 ... 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=317074&mlfb=3RV1421-1EA10-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1EA10-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this breaker carry?","answer":"RoHS compliance date is 01.05.2012. The part is CE-marked as standard for Siemens SIRIUS gear; UL and CSA listings are typical for this series, though not explicitly confirmed in this evidence set."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1EA10-ZX95","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RV1421-1EA10-ZX95 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}